Specialty Optical Fibers Handbook

Coupled twin-core fibers have also been proposed for sensing applications.

An early, but perhaps not so practical, attempt was published in 1983 by Meltz

et al. [75], who demonstrated the temperature-dependent coupling between the

cores in a twin-core fiber.

6.4.2 Uncoupled Cores

If the difference in propagation constants of a multicore fiber or the distances

between the cores are sufficiently large, the coupling of energy between the

waveguides will be so weak that effectively no coupling occurs over the length of

the fiber. The use of such fiber for transmission purposes for cost-effective access

networks was proposed early [50, 76] and was later continued by, for example,

Le Noane et al. [77] at CNET in the mid-1990s and Rosinski [78]. The technique, ...